Radio receiving system



RADIO RECEIVING SYSTEM Filed Feb 1;, 1

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INVENTOR GEORG VON ARCO v i M ma TTORNEY Patented Dec. 9, 1930 UNITED STATES PATENT OFFICE GEORG VON ARGO, F BERLIN, GERMANY, ASSIGNOR TO GESELLSCHAIFT' FIIR DRAHTLOSE TELEGBAPHIE M. B. 31.,

0F BERLIN, GERMANY Application filed February 11, 1926, Serial No. 87,508, and in Germany February 14, 1925.

The present invention relates to a receiving arrangement for transmitted hlgh frequency energy.

, The object of my invention is to provide an arrangement whereby disturbances, especially atmospheric disturbances, may be miniijnized.

Other objects and advantages of my invention will appear more fully as hereinafter set forth in connection with the accompanying drawings, in which The single figure illustrates diagrammatically a preferred embodiment of my invention.

In the usual radio receiving systems which generally comprise a number of electron tubes for the purpose of amplification and rectification, the receiving aerial and the lead by which the incoming high frequency oscillations are fed to the receiver are connected with the apparatus so that all current and potential variations which arise in the aerial cause corresponding actions in the receiving apparatus. As a consequence disturbances, especially strays which consist of the excitation of natural oscillations in the antenna system act upon the receiving apparatus.

By the arrangement herein contemplated, the time isto be shortened during which the receiver is liable and subject to disturbing actions. Indeed, the receiving outfit is capable of' reception only so long as energy is being radiated from the transmitting station. While heretofore for the feeding of tube receivers, it has been customary practice to use a direct current source or else a low frequency alternating current source, in the present invention, the anode potential is furnished by a high frequency current of the frequency of the transmitter to be received from. The high frequency alternating current by which the anode potential is produced in the receiver must be in synchronism and in phase with the desired incoming signal oscillations. If the anode or plate potential is not in phase with the oscillations supplied to the grid of the tube, but is on the contrary displaced by an angle of 180 degrees, then, with a correct adjustment of the working point of the tube,

no current will be able to flow in the plate circuit, so that the indicator will be unable to respond. In accordance with the method contemplated by this invention, an electron tube or an electron tube arrangement is used as the generator for the high frequency current which is to be employed for the feeding of a second electron tube arrangement, which latter constitutes the receiving outfit proper. The tube which is to supply the plate potential, for instance, by means of retroactive coupling, can be adjusted so that it is just below the point of oscillations,--the addition of the desired incoming energy coming from the remote transmitter supplying suflicient energy for the purpose of maintaining the tube in a state of oscillation. If the amount of energy received from the remote transmitting station is insuflicient to produce oscillation for retroactive coupling, then the coupling between the two tubes and the coupling of one tube with the aerial must be made sufficiently close in order that the oscillations of the local tube generator will be produced.

If shock excitations should be produced, by atmospheric discharges, for example, disturbances will be noted in the indicating means due to these cophasal excitations of the local oscillator. In order that this may be prevented from occurring the aerial may be untuned with relation to the oscillations to be received so that the natural period of the aerial possesses another frequency than the frequency to be received and by the aid of special well-known means (phase shifters or advancers) the coupling of the two tube generators with the aerial would be so set that it is solely for the oscillation desired to be received that the proper phase condition or relation between thegrid potential and the receiver of the high frequency plate potential produced by the local generator exists. However, a more preferable scheme is to use two separate aerials for the two tube arrangements and to detune these aerials with reference to'one another, for example, symmetrically above and below the frequency to be received.

' An arrangement according to the invention is shown in the drawing in which A is a receiving aerial coupled through the medium of coils 1, 2 to the triode R Triode R as will be noted is regeneratively coupled as is well known through the medium of coil 3 in the output circuit of R 10 represents the usual receiving telephone. A second aerial system A is shown connected to a triode R through coils 8, 6. Triode R is also regeneratively connected by means of coil 7 and is so arranged and adjusted that oscillations are generated in said triode. For purposes of energizing the plate circuit of triode R a direct current battery 9 is provided. It will be noted that no plate battery appears for the output circuit of tube R However, for purposes of supplying the plate of tube R with the proper potential a transformer T comprising coils 4 and 5 is provided and adapted to feed the high frequency potential of the generator tube R to the plate of tube R The advantage of the system directed above over other arrangements having the aim and purpose of compensation of oscillations of a different frequency, is that by the utilization of phase differences in one tube the energy transfer of a receiver for undesirable oscillations is interrupted.

What I claim is:

1. In a high frequency signalling system, a circuit comprising an electron tube arrangement adapted to oscillate under the influence of incoming oscillations, a second electron tube circuit having a plate circuit coupled to said first circuit and means comprising said first mentioned electron tube circuit for energizing the plate circuit of the second electron tube circuit solely from the high frequency oscillations generated by said first circuit when said first circuit is oscillating under the influence of oscillations remotely excited.

2. A receiving arrangement comprising a tuned input oscillation circuit adapted to oscillate when a frequency to which the circuit is tuned is impressed upon the aerial, a second tuned input discharge tube circuit having a plate circuit, said oscillation circuit being coupled to the plate circuit of said discharge tube circuit, means comprising said oscillation circuit for energizing the plate circuit of said discharge tube, and an indicating device associated with the output circuit of said discharge tube and adapted to respond to desired signals impressed on the second i put circuit.

By the suitable detuning of the aerialE QB. A receiving arrangement comprising a and tuning of the receiving circuits it is feaslble to render the whole receiving arrangement operatlve solely for the frequency of the transmitter to be received, while for all other frequencies, but most particularly for the shock excited natural periods of the aerial, the operative phase relations between the oscillations of the distant transmitter and the high frequency plate potential 10- cally generated, which are pro-requisites for reception, are not established.

For the elimination of the shock excited oscillations it is further suitable to choose the time constants of the oscillatory systems of the total arrangement as diiferently as possible, for by this means the difi'erence in the action of the shock excited oscillations and the impressed oscillations is further promoted; in other words, by choosing the time constants of the circuit incorporating triode R differently from the time constants of the circuit incorporating triode R which may be done by simply proportioning the elements composing the circuits, it will be seen that upon the two circuits being excited by the same shock disturbances one circuit would lag behind the other due to the difference in time constants between the two and in fact the dying down of the oscillations of the circuits would be different.

It will be understood that the details of the method and arrangement herein set forth may be varied and that the general principles herein disclosed may be embodied in other organizations as fairly fall within the scope of the appended claims.

pair of aerials, a tuned oscillatiqn cir-cuit:coupled with one oft heaerialsandadaptedto oscillate when a frequency to whichsthglgircuit is tuned is impressed upon jhe aerial, a second tuned dischargetubecircuithaving a plate circuit, said last named dischargetube circuit being coupled to the other aerial,- said oscillation circuit beingcoupledto the plate circuit of said second nameddischarge tube, said oscillation circuit being adapted to energize the plate circuit of said tube, and an indicating device connected inmtheplate circuit of said tube adapted to respondto desired signals impressed on the input circuit of said tube. M.-,.,.. M

4. In a signal receiving system a pair of aerials detuned with respect to one another, separate electron tube circuits having grid and plate circuits, said electron tube circuits being connected to each of said aerials,one thereof being so adjusted that oscillations will be generated therein under the influence of incoming signals and means comprisingsaid oscillations for energizing the plate circuit'of said other tube circuit.

W5. In a radio system a pair of aerials tuned respectively symmetrically above and below the frequency of incoming energy, an oscillation generator circuit coupled to one of said aerials and an electron tube circuit, hav-' ing grid and plate circuits, coupled to said other aerial, means comprising incoming energy for setting said generator into oppration and means for impressing the resulfing oscillations in the plate circuitoif'saidfelectfon tube circuit. GEORGvoN ARGO. 

